What could I write for Valentines to a friend that I might be developing feelings for?

There's this girl I have been friends with for a while who has been there to listen to my girl problems, help me out with genuine advice from a girl's perspective, but also just be a good friend to me. Now to fill you in on my situation; I was head over heels with this other girl (for over a year mind you) who I would always talk to my friend about, but since recent it never came to be anything, it basically just fell through. After that I was just a mess, but during this time my friend has been there to cheer me up and give me some wisdom to help me get over it. Since then I think I might be developing feelings for my friend, but I'm not sure and would like to find out. Problem now is that she's in Orlando attending college at UCF and the distance doesn't help either. On top of that, last thing I would want to do is scare her off if I were to even humor her about it. Anyways, so since Valentine is coming up and we're both single, I was thinking of sending her a Valentine letter so that at least we could be each others Valentine. Thing is I don't want to make it sound to overly obvious about how I might be feeling, but I would also like to put in some hints to see at least how she feels about me without freaking her out. Yeah, it's a tough one. But I'm hoping someone among the Yahoo Community can help. Any suggestions as to what I can write? Maybe a friendly message with romantic undertones? Please help!